[No authors listed]
The maize crinkly4 (cr4) mutation affects leaf epidermis differentiation such that cell size and morphology are altered, and surface functions are compromised, allowing graft-like fusions between organs. In the seed, loss of cr4 inhibits aleurone formation in a pattern that reflects the normal progression of differentiation over the developing endosperm surface. The cr4 gene was isolated by transposon tagging and found to encode a putative receptor kinase. The extracellular domain contains a cysteine-rich region similar to the ligand binding domain in mammalian tumor necrosis factor receptors (TNFRs) and seven copies of a previously unknown 39-amino acid repeat. The results suggest a role for cr4 in a differentiation signal.
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